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The Efficiency of Nitrogen and Flue Gas as Operating Gases in Explosive Decompression Pretreatment

Author

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  • Merlin Raud

    (Institute of Technology, Estonian University of Life Sciences, 56 Kreutzwaldi Str., 51014 Tartu, Estonia)

  • Vahur Rooni

    (Institute of Technology, Estonian University of Life Sciences, 56 Kreutzwaldi Str., 51014 Tartu, Estonia)

  • Timo Kikas

    (Institute of Technology, Estonian University of Life Sciences, 56 Kreutzwaldi Str., 51014 Tartu, Estonia)

Abstract

As the pretreatment process is the most expensive and energy-consuming step in the overall second generation bioethanol production process, it is vital that it is studied and optimized in order to be able to develop the most efficient production process. The aim of this paper was to investigate chemical and physical changes in biomass during the process of applying the explosive decompression pretreatment method using two different gases—N 2 and synthetic flue gas. The explosive decompression method is economically and environmentally attractive since no chemicals are used—rather it is pressure that is applied—and water is used to break down the biomass structure. Both pre-treatment methods were used at different temperatures. To be able to compare the effects of the pretreatment, samples from different process steps were gathered together and analysed. The results were used to assess the efficiency of the pretreatment, the chemical and physical changes in the biomass and, finally, the mass balances were compiled for the process during the different process steps of bioethanol production. The results showed that both pre-treatment methods are effective in hemicellulose dissolution, while the cellulose content decreases to a smaller degree. The high glucose and ethanol yields were gained with both explosive pretreatment methods at 175 °C (15.2–16.0 g glucose and 5.6–9.0 g ethanol per 100 g of dry biomass, respectively).

Suggested Citation

  • Merlin Raud & Vahur Rooni & Timo Kikas, 2018. "The Efficiency of Nitrogen and Flue Gas as Operating Gases in Explosive Decompression Pretreatment," Energies, MDPI, vol. 11(8), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:2074-:d:162752
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    Cited by:

    1. Merve Nazli Borand & Asli Isler Kaya & Filiz Karaosmanoglu, 2020. "Saccharification Yield through Enzymatic Hydrolysis of the Steam-Exploded Pinewood," Energies, MDPI, vol. 13(17), pages 1-12, September.
    2. Raud, M. & Kikas, T. & Sippula, O. & Shurpali, N.J., 2019. "Potentials and challenges in lignocellulosic biofuel production technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 111(C), pages 44-56.
    3. Raud, M. & Krennhuber, K. & Jäger, A. & Kikas, T., 2019. "Nitrogen explosive decompression pre-treatment: An alternative to steam explosion," Energy, Elsevier, vol. 177(C), pages 175-182.
    4. Rooni, V. & Sjulander, N. & Cristobal-Sarramian, A. & Raud, M. & Rocha-Meneses, Lisandra & Kikas, T., 2021. "The efficiency of nitrogen explosion pretreatment on common aspen – Populus tremula: N2– VS steam explosion," Energy, Elsevier, vol. 220(C).
    5. Lisandra Rocha-Meneses & Jorge A Ferreira & Nemailla Bonturi & Kaja Orupõld & Timo Kikas, 2019. "Enhancing Bioenergy Yields from Sequential Bioethanol and Biomethane Production by Means of Solid–Liquid Separation of the Substrates," Energies, MDPI, vol. 12(19), pages 1-16, September.

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